Means for stiffening sheets of metal and other material.



W. E. WILLIAMS.

MEANS FOR STIFFENING SHEETS 0F METAL AND OTHER MATERIAL.

APPLICATION FILED Nov 9. i914.

l ,191 ,863. lnfontvd July 18, 1916.

" UNITED STATES PATENT oFFCE.

WILLIAM ERASTUS 'WILIIIIYII 0F CHICAGO, ILLINOIS..

MEANS Fon STIFFENING SHEETS'OEMETAL AND OTHER' MATERIAL.

Specification of Lettersl Patent.

Patented July-18,1916.

Application led November 9, 1914. Serial No. 871,038.

To all whom z't may concern:

Be it known that I, WiLLIAM ERAsTUs IVILLIAMs, a citizen 'ofthe United States, residing at Chicago, county of Cook, and State of Illinois, have invented a new and useful of -sheets embossed 'in accordance with my invention. Fig. 2 is a transverse sectional view of the structure shown .in Fig. 1. Fig. 3 shows a marginal finish for a sheet.- Fig. 4 shows Vanother form of margin for a sheet.I Fig. 5 shows a marginal inish developed from Fig. 4.- Fig. 6 shows another marginal finish developed from Fig. 4.

In the drawing 1 indicates sheets of metal or other suitable material capable of being embossed.

2 indicates cup shaped bosses pressed into the sheets at sultable intervals.

3 indicates ribs that run along lines intersecting each other at the centers ofthe bosses.

The cups are approximately twice as deep as the ribs and both are embossed in the same direction from the surface of the sheet. Thus the bending moment of resistance is as great across the cups in any direction as it is across the ribsl transversely of any rib or line across the sheet or more specifically the bendin moment of'resistance is as reat across Iine A-A as it is across line B, Fig. 1," and the same is true across 'corresponding lines transversel of' the sheet. Thus by my construction, vsecure a sheet equally sti in both directions.

In using my sti'ened sheets for sheathing of an kind, laps may be made as is indica-ted y the sheets 4, 5 and 6.

When my sheets are used as separate panels, for doors and similar purposes, I stlien and finish the edges by bendinga large rib along the edge approxlmately as deep as the cups, and 7 in Fig.` 3, indicates such a marginal rib. A

Fig. 4'shows a rib with a flange 8 extendlng above the. bodyof the sheet on the opposite side of the sheet from the ribs and bosses. This flange may. be pressed up tightly closing the space 9, Fig. 4 so thatl it .will appear llke the rib 10, Fig. 6 and thel flange 8 may-be bent over upon the body of the plate as indicated b 11 Fig. 5 and then riveted orspot welde to the sheet as indicated by 12, Fig. 5.

In place of closing space 9, Fig.- 4, it'may be allowed lto .remain open and still turn over the flange 8 so that 1t will appear as is indicated by 13,- Fig.- 6 and it may bewelded or riveted to the plate as indicated by 14.

`This structure maybe used for such articles as carpet-lining, mailing board and various articles made out of'k paper pulp or kindred materials, and may be used for articles made out .of-celluloid, gelatin and various other'materials, but its chief use will be with metals.

The ribs mayextend in variousdirections instead of perpendicularly to each otheras shown in the drawing.

-What I claim is:

1. A sheet, consistin of material'adapted to be molded or pressed and to aford strong resistancey to distortion ywhen formed, provided on'one face with two series of hollowl ribs or corrugati'ons lof substantially uniform cross section extending along intersecting sets of lines and merging into higher bosses locatedat the points of intersection, respectively.'

2. A sheet, consisting of material adapted to be molded or pressed into desired form andto strongly resist distortion when formed, provided on one face with hollow ribs orcorrugations running along intersecting sets of lines yand merging into hollow bosses higher and broader than they ribs.

3. A metal sheet of substantially uniform thickness having pressed up from one face ribs running along intersecting sets of lines and higher and broader bossesinto which the ribs merge near the point-s of intersec tion.

4. sheet, consisting of material adapted to be molded or pressed and to` afford strong resistance to distortion when formed, provided upon one face with .two series of holmemes tending along intersecting sets of lines and ln Witness whereof, l have hereunto signed y merging into higher bosses located at the my name at Chicago, llllinois,- on the 29th points of intersection, respectively, and furday of CtOber, 1914.

ther provided with marginal ribs in which WHLMM ERASTUS WlLLIAiIS. the said sheet is bent sharply upward and Witnesses: doubled backupon itself, substantially as i/iiUGUsT C. RIEGHERS,

@et forth. A. D. SHANKLIN. 

